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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value Based on Three-Tier Fair Value Hierarchy (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | $ 166,392 | $ 133,358
Total liabilities measured and recorded at fair value | 143 | 159
Cash equivalents [Member] | Money market funds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 54,923 | 62,131
Cash equivalents [Member] | Corporate bonds [Member] | Maturity less than 90 days [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 3,614 |
Cash equivalents [Member] | U.S. federal government bonds [Member] | Maturity less than 90 days [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 3,005 |
Short-term investments [Member] | Corporate bonds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 31,562 | 18,604
Short-term investments [Member] | U.S. federal government bonds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 2,003 | 9,230
Short-term investments [Member] | Certificates of deposit [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 1,603 |
Short-term investments [Member] | State, municipal and local government agencies bonds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 59,050 | 38,825
Short-term investments [Member] | Commercial paper [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 10,288 | 4,195
Prepaids and other current assets [Member] | Foreign exchange forward contracts [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 344 | 373
Accrued liabilities [Member] | Foreign exchange forward contracts [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total liabilities measured and recorded at fair value | 143 | 159
Level 1 [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 59,931 | 71,361
Level 1 [Member] | Cash equivalents [Member] | Money market funds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 54,923 | 62,131
Level 1 [Member] | Cash equivalents [Member] | U.S. federal government bonds [Member] | Maturity less than 90 days [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 3,005 |
Level 1 [Member] | Short-term investments [Member] | U.S. federal government bonds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 2,003 | 9,230
Level 2 [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 106,461 | 61,997
Total liabilities measured and recorded at fair value | 143 | 159
Level 2 [Member] | Cash equivalents [Member] | Corporate bonds [Member] | Maturity less than 90 days [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 3,614 |
Level 2 [Member] | Short-term investments [Member] | Corporate bonds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 31,562 | 18,604
Level 2 [Member] | Short-term investments [Member] | Certificates of deposit [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 1,603 |
Level 2 [Member] | Short-term investments [Member] | State, municipal and local government agencies bonds [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 59,050 | 38,825
Level 2 [Member] | Short-term investments [Member] | Commercial paper [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 10,288 | 4,195
Level 2 [Member] | Prepaids and other current assets [Member] | Foreign exchange forward contracts [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total assets measured and recorded at fair value | 344 | 373
Level 2 [Member] | Accrued liabilities [Member] | Foreign exchange forward contracts [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Total liabilities measured and recorded at fair value | $ 143 | $ 159

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